/**
 * Copyright 2010, 2011 Jingjing Li.
 *
 * This file is part of jplot2d.
 *
 * jplot2d is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 *
 * jplot2d is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with jplot2d. If not, see <http://www.gnu.org/licenses/>.
 */
package org.jplot2d.interaction;

import java.awt.event.MouseEvent;

public abstract class MouseDragBehaviorHandler<T extends MouseDragBehavior> extends
		MouseBehaviorHandler<T> {

	private boolean indrag;

	public MouseDragBehaviorHandler(T behavior, InteractionModeHandler handler) {
		super(behavior, handler);
	}

	@Override
	public final boolean processMouseEvent(GenericMouseEvent e) {
		if (e.getType() == MouseEvent.MOUSE_PRESSED && canStartDargging(e.getX(), e.getY())) {
			indrag = true;
			draggingStarted(e.getX(), e.getY());
			return true;
		}
		if (e.getType() == MouseEvent.MOUSE_DRAGGED) {
			if (indrag) {
				draggingTo(e.getX(), e.getY());
				return true;
			}
		}
		if (e.getType() == MouseEvent.MOUSE_RELEASED) {
			if (indrag) {
				indrag = false;
				draggingFinished(e.getX(), e.getY());
				return true;
			}
		}
		return false;
	}

	public abstract boolean canStartDargging(int x, int y);

	public abstract void draggingStarted(int x, int y);

	public abstract void draggingTo(int x, int y);

	public abstract void draggingFinished(int x, int y);

	public abstract void draggingCancelled();

}